WO2008127992A1 - Ink-jet ink sets - Google Patents

Ink-jet ink sets Download PDF

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Publication number
WO2008127992A1
WO2008127992A1 PCT/US2008/059935 US2008059935W WO2008127992A1 WO 2008127992 A1 WO2008127992 A1 WO 2008127992A1 US 2008059935 W US2008059935 W US 2008059935W WO 2008127992 A1 WO2008127992 A1 WO 2008127992A1
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WO
WIPO (PCT)
Prior art keywords
dye
ink
formula
jet
substrate
Prior art date
Application number
PCT/US2008/059935
Other languages
French (fr)
Inventor
Matthew Thornberry
Hiang P. Lauw
Raymond Adamic
James P. Shields
Original Assignee
Hewlett-Packard Development Company, L.P.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hewlett-Packard Development Company, L.P. filed Critical Hewlett-Packard Development Company, L.P.
Priority to EP08745533.3A priority Critical patent/EP2137273B1/en
Priority to CN2008800154337A priority patent/CN101679793B/en
Publication of WO2008127992A1 publication Critical patent/WO2008127992A1/en

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks
    • C09D11/40—Ink-sets specially adapted for multi-colour inkjet printing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]

Definitions

  • inkjet printing systems in offices and homes has grown dramatically in recent years.
  • the growth can be attributed to drastic reductions in the cost of inkjet printers and substantial improvements in print resolution and overall print quality. While the print quality has drastically improved, research and development efforts continue toward improving the water durability of inkjet prints because this property still falls short of the prints produced by some other printing techniques.
  • a continued demand in inkjet printing has resulted in the need to produce high quality prints with good permanence and water durability, while maintaining a reasonable cost.
  • the inkjet image is formed on a print medium when a precise pattern of dots is ejected from a drop-generating device known as a printhead.
  • the typical inkjet printhead has an array of precisely formed nozzles located on a nozzle plate and attached to an inkjet printhead array.
  • the inkjet printhead array incorporates an array of firing chambers that receive liquid ink, which includes pigment-based inks and/or dye-based inks dissolved or dispersed in a liquid vehicle, through fluid communication with one or more ink reservoirs.
  • Each chamber has a thin-film resistor, known as a firing resistor, located opposite the nozzle so ink can collect between the firing resistor and the nozzle.
  • a droplet of ink is expelled through the nozzle toward the print medium to produce the image.
  • embodiments of this disclosure include ink-jet ink sets, printer systems, methods of printing, and printing materials.
  • One exemplary ink- jet ink set includes: a first ink and a second ink, wherein the first ink and the second ink are different dye colors, wherein each of the first ink and the second ink include at least one dye selected from a magenta dye, a yellow dye, and a black dye, and wherein the dye is a sulfonated non-metalized azo dye with a SO 3 H molecular weight percent of from about 10 to 27%.
  • An exemplary printer system includes: a dispensing system including a substrate and at least one printhead, wherein the substrate includes a multivalent salt associated with the substrate, wherein multivalent salt is selected from Group Il metals (alkaline earth metals), Group III metals (lanthanides), and multivalent transition metals, wherein the printhead includes at least one of an ink-jet set, wherein the ink-jet set includes a first ink and a second ink: a first ink and a second ink, wherein the first ink and the second ink are different dye colors, wherein each of the first ink and the second ink include at least one dye selected from a magenta dye, a yellow dye, and a black dye, and wherein the dye is a sulfonated non-metalized azo dye with a SO 3 H molecular weight percent of from about 10 to 27%.
  • a dispensing system including a substrate and at least one printhead, wherein the substrate includes a multivalent salt associated with the substrate,
  • An exemplary printing material includes: a substrate that includes a multivalent salt associated with the substrate, wherein multivalent salt is selected from Group Il metals (alkaline earth metals), Group III metals (lanthanides), and multivalent transition metals; and a first ink and a second ink, wherein the first ink and the second ink are different dye colors, wherein each of the first ink and the second ink include at least one dye selected from a magenta dye, a yellow dye, and a black dye, and wherein the dye is a sulfonated non- metalized azo dye with a SO 3 H molecular weight percent of from about 10 to 27%, wherein the first ink and the second ink are disposed on the substrate.
  • multivalent salt is selected from Group Il metals (alkaline earth metals), Group III metals (lanthanides), and multivalent transition metals
  • a first ink and a second ink wherein the first ink and the second ink are different dye colors, wherein each of the first in
  • An exemplary method of printing includes: providing a substrate that includes a multivalent salt associated with the substrate, wherein multivalent salt is selected from Group Il metals (alkaline earth metals), Group III metals (lanthanides), and multivalent transition metals; providing a first ink and a second ink, wherein the first ink and the second ink are different dye colors, wherein each of the first ink and the second ink include at least one dye selected from a magenta dye, a yellow dye, and a black dye, and wherein the dye is a sulfonated non-metalized azo dye with a SO 3 H molecular weight percent of from about 10 to 27%; and disposing the first ink and the second ink on the substrate.
  • multivalent salt is selected from Group Il metals (alkaline earth metals), Group III metals (lanthanides), and multivalent transition metals
  • providing a first ink and a second ink wherein the first ink and the second ink are different dye colors, wherein each of the
  • FIG. 1 illustrates an embodiment of a printer system.
  • FIGS. 2A-2E illustrate embodiments of black dye compounds having formula I 1 II, III, IV, and V.
  • FIGS. 3A-3B illustrate embodiments of magenta dye compounds having formula Vl and VII.
  • FIGS. 4A-4C illustrate embodiments of yellow dye compounds having formula VIII, X, Xl.
  • Embodiments of the present disclosure include ink-jet sets including at least two inks, where each ink includes one or more sulfonated non-metalized azo dyes with a SO 3 H molecular weight percentage of about 10 to 27% for the sulfonic acid form of the dye. It is understood that the ink may contain the sulfonic acid and sulfonate forms of a dye where counterions such as lithium, sodium, potassium, and/or ammonium may be present.
  • the ink-jet sets provide enhanced waterfastness on an ink-jet printing media.
  • the ink-jet media includes a paper substrate and a multivalent salt (e.g., salt of Ca) associated with the paper substrate, and, optionally, an additive.
  • a multivalent salt e.g., salt of Ca
  • the relatively low SO 3 H molecular weight percent of the sulfonated non-metalized azo dyes improve waterfastness by decreasing the solubility of the dye and its complexes with multivalent salts (for example, calcium chloride, CaCI 2 ) contained within the printing medium.
  • FIG. 1 illustrates a block diagram of a representative printer system 10 that includes a computer control system 12, an ink dispensing system 14, and a print medium 18.
  • the computer control system 12 includes a process control system that is operative to control the ink dispensing system 14.
  • the computer control system 12 instructs and controls the ink dispensing system 14 to print characters, symbols, photos, etc. onto the print medium 18.
  • the ink dispensing system 14 includes, but is not limited to, an ink-jet set, ink-jet technologies, and coating technologies, which dispense the dyes of the ink-jet set onto the print medium 18.
  • Ink-jet technology such as drop-on- demand and continuous flow ink-jet technologies, can be used to dispense the dyes of the ink-jet set.
  • the ink dispensing system 14 can include at least one ink-jet printhead system (e.g., thermal ink-jet printhead and/or a piezo ink-jet print head) operative to dispense (e.g., jet) the dyes through one or more of a plurality of nozzles in a printhead.
  • the term "plurality” as used herein refers to both one or more, and a multitude.
  • the printhead system incorporates an array of firing chambers that receive the dye dissolved or dispersed in a liquid vehicle, which are in fluid communication with one or more dye reservoirs.
  • substrate can include paper substrates include, but is not limited to, woody, synthetic, recycled, or fabric papers.
  • print media can include a multivalent salt associated with the paper substrate.
  • the metallic salts that can be used include, but are not limited to, Group Il metals (alkaline earth metals), Group III metals (lanthanides), and multivalent transition metals.
  • the metallic cations that can be produced using these salts include, but are not limited to, calcium, magnesium, copper, nickel, zinc, barium, iron, aluminum, chromium, or the like.
  • the anionic species of the salt can be chloride, acetate, benzoate, nitrate, sulfate, sulfite, and toluene sulfonate, or the like.
  • calcium chloride is a preferred multivalent metal salt that can be used in accordance with embodiments of the present disclosure.
  • the "print media", “print medium”, or “ink-jet media” includes one or more additives such as, but not limited to, a pigment, a binder, starch, an optical brightener, a dye, a lubricant, a surfactant, a rheological modifiers, a crosslinker, a defoamer, and a dispersing agent.
  • Embodiments of the "print media”, “print medium”, or “ink-jet media” are also described in U.S. Patent Application 20060228499, which is incorporated herein by reference.
  • the substrate or print media has been printed upon (e.g., ink has been disposed onto the substrate of print media) the substrate is termed a "printing material”.
  • the ink-jet ink set includes, but is not limited to, two or more inks, where each ink includes one or more sulfonated non-metalized azo dyes with a SO 3 H molecular weight percentage of about 10 to 27% for the sulfonic acid form of the dye.
  • the ink-jet set includes, but is not limited to, a first ink, a second ink, and a third ink, where each ink is a different color.
  • the colorants in each of the first ink, the second ink, and the third ink are selected from a magenta dye, a yellow dye, and a black dye.
  • the colorant can include a cyan dye.
  • Each dye is a sulfonated non-metalized azo dye with a SO 3 H molecular weight percent of from about 10 to 27%, about 15 to 27%, or about 18 to 27%.
  • the magenta dye can include, but is not limited to, compounds having Vl (Direct Red 253) and VII (Direct Red 23), as shown in FIGS. 3A-3B.
  • the yellow dye can include, but is not limited to, compounds having formula VIII (Direct Yellow 44), IX (Acid Yellow 36), and X (Direct Yellow 132), as shown in FIGS. 4A-4C.
  • Two other waterfast, commercially available dyes with unknown structures are PRO-JET Fast Magenta 2 (Direct Violet 107) and PRO-JET Fast Yellow 2 (Direct Yellow 173) from FujiFilm Imaging & Colorants.
  • the ink-jet set can include other waterfast inks (e.g., dye-based inks and pigment-based inks).
  • the waterfast ink can include, but is not limited to, waterfast cyan dyes (e.g., Direct Blue 307 from FujiFilm Imaging & Colorants).
  • the ink-jet set can include an ink that includes two or more of: a magenta dye, a yellow dye, a black dye, a waterfast cyan dye. The combination of the waterfast magenta dye, the waterfast yellow dye, the waterfast black dye, and the waterfast cyan dyes can be used to produce primary, secondary and neutral color inks.
  • ratios, concentrations, amounts, and other numerical data may be expressed herein in a range format. It is to be understood that such a range format is used for convenience and brevity, and thus, should be interpreted in a flexible manner to include not only the numerical values explicitly recited as the limits of the range, but also to include all the individual numerical values or sub-ranges encompassed within that range as if each numerical value and sub-range is explicitly recited.
  • a concentration range of "about 0.1 % to about 5%” should be interpreted to include not only the explicitly recited concentration of about 0.1 wt% to about 5 wt%, but also include individual concentrations (e.g., 1%, 2%, 3%, and 4%) and the sub-ranges (e.g., 0.5%, 1.1%, 2.2%, 3.3%, and 4.4%) within the indicated range.
  • the term “about” can include ⁇ 1 %, ⁇ 2%, ⁇ 3%, ⁇ 4%, ⁇ 5%, ⁇ 6%, ⁇ 7%, ⁇ 8%, ⁇ 9%, or ⁇ 10%, or more of the numerical value(s) being modified.
  • the phrase "about 'x' to 'y'" includes “about 'x' to about 'y'".
  • Inks were made using an ink vehicle like that shown below (or another vehicle known in the art). An ink absorbance of 0.28 AU at 5000 fold ink dilution was targeted. This generally yielded inks with dye-loadings of about 1-7 weight percent. All inks were passed through a 0.2 micron filter during pen fill. Table 1
  • a set of four horizontal bars measuring 1.5 by 0.5 cm with 0.5 cm spacing between bars are printed on the target print medium (for example, HP Multipurpose Paper with ColorLok). All prints are allowed to dry for at least 30 minutes. The print is held at a 45 degree angle while 100 microliters of deionized water are dripped over the set of four bars. The print is then allowed to dry for at least 30 minutes after which the color change ( ⁇ E) of the printed bars before and after dripping are measured using a spectrophotometer such as a GretagMacBeth SpectroEye. The maximum ⁇ E is reported in the Table 2.

Abstract

Ink-jet sets, printer systems, methods of printing, and printing materials are disclosed.

Description

INK-JET INK SETS
BACKGROUND
The use of inkjet printing systems in offices and homes has grown dramatically in recent years. The growth can be attributed to drastic reductions in the cost of inkjet printers and substantial improvements in print resolution and overall print quality. While the print quality has drastically improved, research and development efforts continue toward improving the water durability of inkjet prints because this property still falls short of the prints produced by some other printing techniques. A continued demand in inkjet printing has resulted in the need to produce high quality prints with good permanence and water durability, while maintaining a reasonable cost.
In inkjet printing, the inkjet image is formed on a print medium when a precise pattern of dots is ejected from a drop-generating device known as a printhead. The typical inkjet printhead has an array of precisely formed nozzles located on a nozzle plate and attached to an inkjet printhead array. The inkjet printhead array incorporates an array of firing chambers that receive liquid ink, which includes pigment-based inks and/or dye-based inks dissolved or dispersed in a liquid vehicle, through fluid communication with one or more ink reservoirs. Each chamber has a thin-film resistor, known as a firing resistor, located opposite the nozzle so ink can collect between the firing resistor and the nozzle. Upon energizing of a particular firing resistor, a droplet of ink is expelled through the nozzle toward the print medium to produce the image.
SUMMARY
Briefly described, embodiments of this disclosure include ink-jet ink sets, printer systems, methods of printing, and printing materials. One exemplary ink- jet ink set, among others, includes: a first ink and a second ink, wherein the first ink and the second ink are different dye colors, wherein each of the first ink and the second ink include at least one dye selected from a magenta dye, a yellow dye, and a black dye, and wherein the dye is a sulfonated non-metalized azo dye with a SO3H molecular weight percent of from about 10 to 27%.
An exemplary printer system, among others, includes: a dispensing system including a substrate and at least one printhead, wherein the substrate includes a multivalent salt associated with the substrate, wherein multivalent salt is selected from Group Il metals (alkaline earth metals), Group III metals (lanthanides), and multivalent transition metals, wherein the printhead includes at least one of an ink-jet set, wherein the ink-jet set includes a first ink and a second ink: a first ink and a second ink, wherein the first ink and the second ink are different dye colors, wherein each of the first ink and the second ink include at least one dye selected from a magenta dye, a yellow dye, and a black dye, and wherein the dye is a sulfonated non-metalized azo dye with a SO3H molecular weight percent of from about 10 to 27%.
An exemplary printing material, among others, includes: a substrate that includes a multivalent salt associated with the substrate, wherein multivalent salt is selected from Group Il metals (alkaline earth metals), Group III metals (lanthanides), and multivalent transition metals; and a first ink and a second ink, wherein the first ink and the second ink are different dye colors, wherein each of the first ink and the second ink include at least one dye selected from a magenta dye, a yellow dye, and a black dye, and wherein the dye is a sulfonated non- metalized azo dye with a SO3H molecular weight percent of from about 10 to 27%, wherein the first ink and the second ink are disposed on the substrate.
An exemplary method of printing, among others, includes: providing a substrate that includes a multivalent salt associated with the substrate, wherein multivalent salt is selected from Group Il metals (alkaline earth metals), Group III metals (lanthanides), and multivalent transition metals; providing a first ink and a second ink, wherein the first ink and the second ink are different dye colors, wherein each of the first ink and the second ink include at least one dye selected from a magenta dye, a yellow dye, and a black dye, and wherein the dye is a sulfonated non-metalized azo dye with a SO3H molecular weight percent of from about 10 to 27%; and disposing the first ink and the second ink on the substrate.
BRIEF DESCRIPTION OF THE DRAWINGS
Many aspects of this disclosure can be better understood with reference to the following drawings. The components in the drawings are not necessarily to scale. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
FIG. 1 illustrates an embodiment of a printer system.
FIGS. 2A-2E illustrate embodiments of black dye compounds having formula I1 II, III, IV, and V.
FIGS. 3A-3B illustrate embodiments of magenta dye compounds having formula Vl and VII.
FIGS. 4A-4C illustrate embodiments of yellow dye compounds having formula VIII, X, Xl.
DETAILED DESCRIPTION
Ink-jet ink sets, printer systems including ink-jet sets, methods of printing, and printing material are described. Embodiments of the present disclosure include ink-jet sets including at least two inks, where each ink includes one or more sulfonated non-metalized azo dyes with a SO3H molecular weight percentage of about 10 to 27% for the sulfonic acid form of the dye. It is understood that the ink may contain the sulfonic acid and sulfonate forms of a dye where counterions such as lithium, sodium, potassium, and/or ammonium may be present. The ink-jet sets provide enhanced waterfastness on an ink-jet printing media. The ink-jet media includes a paper substrate and a multivalent salt (e.g., salt of Ca) associated with the paper substrate, and, optionally, an additive. Although not intending to be bound by theory, the relatively low SO3H molecular weight percent of the sulfonated non-metalized azo dyes improve waterfastness by decreasing the solubility of the dye and its complexes with multivalent salts (for example, calcium chloride, CaCI2) contained within the printing medium. FIG. 1 illustrates a block diagram of a representative printer system 10 that includes a computer control system 12, an ink dispensing system 14, and a print medium 18. The computer control system 12 includes a process control system that is operative to control the ink dispensing system 14. In particular, the computer control system 12 instructs and controls the ink dispensing system 14 to print characters, symbols, photos, etc. onto the print medium 18.
The ink dispensing system 14 includes, but is not limited to, an ink-jet set, ink-jet technologies, and coating technologies, which dispense the dyes of the ink-jet set onto the print medium 18. Ink-jet technology, such as drop-on- demand and continuous flow ink-jet technologies, can be used to dispense the dyes of the ink-jet set. The ink dispensing system 14 can include at least one ink-jet printhead system (e.g., thermal ink-jet printhead and/or a piezo ink-jet print head) operative to dispense (e.g., jet) the dyes through one or more of a plurality of nozzles in a printhead. The term "plurality" as used herein refers to both one or more, and a multitude. The printhead system incorporates an array of firing chambers that receive the dye dissolved or dispersed in a liquid vehicle, which are in fluid communication with one or more dye reservoirs.
The terms "substrate", "print media", "print medium", or "ink-jet media" can include paper substrates include, but is not limited to, woody, synthetic, recycled, or fabric papers. In addition, "print media", "print medium", or "ink-jet media" include a multivalent salt associated with the paper substrate. The metallic salts that can be used include, but are not limited to, Group Il metals (alkaline earth metals), Group III metals (lanthanides), and multivalent transition metals. In particular, the metallic cations that can be produced using these salts include, but are not limited to, calcium, magnesium, copper, nickel, zinc, barium, iron, aluminum, chromium, or the like. The anionic species of the salt can be chloride, acetate, benzoate, nitrate, sulfate, sulfite, and toluene sulfonate, or the like. In one embodiment, calcium chloride is a preferred multivalent metal salt that can be used in accordance with embodiments of the present disclosure. In an embodiment, the "print media", "print medium", or "ink-jet media" includes one or more additives such as, but not limited to, a pigment, a binder, starch, an optical brightener, a dye, a lubricant, a surfactant, a rheological modifiers, a crosslinker, a defoamer, and a dispersing agent. Embodiments of the "print media", "print medium", or "ink-jet media" are also described in U.S. Patent Application 20060228499, which is incorporated herein by reference. Once the substrate or print media has been printed upon (e.g., ink has been disposed onto the substrate of print media) the substrate is termed a "printing material".
As mentioned above, the ink-jet ink set includes, but is not limited to, two or more inks, where each ink includes one or more sulfonated non-metalized azo dyes with a SO3H molecular weight percentage of about 10 to 27% for the sulfonic acid form of the dye. In an embodiment, the ink-jet set includes, but is not limited to, a first ink, a second ink, and a third ink, where each ink is a different color. The colorants in each of the first ink, the second ink, and the third ink are selected from a magenta dye, a yellow dye, and a black dye. In an embodiment, the colorant can include a cyan dye. Each dye is a sulfonated non-metalized azo dye with a SO3H molecular weight percent of from about 10 to 27%, about 15 to 27%, or about 18 to 27%.
The black dye can include, but is not limited to, compounds having formula I (where X = H or SO3H), formula Il (Direct Black 171), formula III (Direct Black 19), formula IV (Direct Black 154), and formula V, as shown in FIGS. 2A- 2E. The magenta dye can include, but is not limited to, compounds having Vl (Direct Red 253) and VII (Direct Red 23), as shown in FIGS. 3A-3B. The yellow dye can include, but is not limited to, compounds having formula VIII (Direct Yellow 44), IX (Acid Yellow 36), and X (Direct Yellow 132), as shown in FIGS. 4A-4C. Two other waterfast, commercially available dyes with unknown structures are PRO-JET Fast Magenta 2 (Direct Violet 107) and PRO-JET Fast Yellow 2 (Direct Yellow 173) from FujiFilm Imaging & Colorants.
The ink-jet set can include other waterfast inks (e.g., dye-based inks and pigment-based inks). In particular, the waterfast ink can include, but is not limited to, waterfast cyan dyes (e.g., Direct Blue 307 from FujiFilm Imaging & Colorants). In an embodiment, the ink-jet set can include an ink that includes two or more of: a magenta dye, a yellow dye, a black dye, a waterfast cyan dye. The combination of the waterfast magenta dye, the waterfast yellow dye, the waterfast black dye, and the waterfast cyan dyes can be used to produce primary, secondary and neutral color inks.
It should be noted that ratios, concentrations, amounts, and other numerical data may be expressed herein in a range format. It is to be understood that such a range format is used for convenience and brevity, and thus, should be interpreted in a flexible manner to include not only the numerical values explicitly recited as the limits of the range, but also to include all the individual numerical values or sub-ranges encompassed within that range as if each numerical value and sub-range is explicitly recited. To illustrate, a concentration range of "about 0.1 % to about 5%" should be interpreted to include not only the explicitly recited concentration of about 0.1 wt% to about 5 wt%, but also include individual concentrations (e.g., 1%, 2%, 3%, and 4%) and the sub-ranges (e.g., 0.5%, 1.1%, 2.2%, 3.3%, and 4.4%) within the indicated range. The term "about" can include ±1 %, ±2%, ±3%, ±4%, ±5%, ±6%, ±7%, ±8%, ±9%, or ±10%, or more of the numerical value(s) being modified. In addition, the phrase "about 'x' to 'y'" includes "about 'x' to about 'y'".
Many variations and modifications may be made to the above-described embodiments. All such modifications and variations are intended to be included herein within the scope of this disclosure and protected by the following claims.
Example 1
Inks were made using an ink vehicle like that shown below (or another vehicle known in the art). An ink absorbance of 0.28 AU at 5000 fold ink dilution was targeted. This generally yielded inks with dye-loadings of about 1-7 weight percent. All inks were passed through a 0.2 micron filter during pen fill. Table 1
Figure imgf000008_0001
For each ink, a set of four horizontal bars measuring 1.5 by 0.5 cm with 0.5 cm spacing between bars are printed on the target print medium (for example, HP Multipurpose Paper with ColorLok). All prints are allowed to dry for at least 30 minutes. The print is held at a 45 degree angle while 100 microliters of deionized water are dripped over the set of four bars. The print is then allowed to dry for at least 30 minutes after which the color change (ΔE) of the printed bars before and after dripping are measured using a spectrophotometer such as a GretagMacBeth SpectroEye. The maximum ΔE is reported in the Table 2.
Table 2
Figure imgf000009_0001

Claims

At least the following is claimed:
1. An ink-jet ink set, comprising: a first ink and a second ink, wherein the first ink and the second ink are different dye colors, wherein each of the first ink and the second ink include at least one dye selected from a magenta dye, a yellow dye, and a black dye, and wherein the dye is a sulfonated non-metalized azo dye with a SO3H molecular weight percent of from about 10 to 27%.
2. The ink-jet ink set of claim 1 , wherein the dye is selected from:
Figure imgf000011_0001
wherein X is selected from H or SO3H.
. The ink-jet ink set of claim 1 , wherein the dye is selected from:
Figure imgf000012_0001
Formula Vl, and
Figure imgf000012_0002
Formula VII.
. The ink-jet ink set of claim 1 , wherein the dye is selected from:
Figure imgf000013_0001
Formula VIII,
Formula IX, and
Figure imgf000013_0002
Figure imgf000013_0003
Formula X.
5. A printer system, comprising: a dispensing system including a substrate and at least one printhead, wherein the substrate includes a multivalent salt associated with the substrate, wherein the multivalent salt is selected from Group Il metal,
Group III metals, and multivalent transition metals, wherein the printhead includes at least one of an ink-jet set, wherein the ink-jet set includes a first ink and a second ink: a first ink and a second ink, wherein the first ink and the second ink are different dye colors, wherein each of the first ink and the second ink include at least one dye selected from a magenta dye, a yellow dye, and a black dye, and wherein the dye is a sulfonated non-metalized azo dye with a SO3H molecular weight percent of from about 10 to 27%.
6. The printer system of claim 5, wherein the ink-jet set further comprising a second dye that is a sulfonated non-metalized azo dye with a SO3H molecular weight percent of from 10 to 27%.
7. The printer system of claim 5, wherein the one of the first dye and the second dye are selected from:
Figure imgf000015_0001
wherein X is selected from H or SO3H.
. The printer system of claim 5, wherein the one of the first dye and the second dye are selected from:
Figure imgf000016_0001
Formula Vl, and
Figure imgf000016_0002
Formula VII.
. The printer system of claim 5, wherein the one of the first dye and the second dye are selected from:
Figure imgf000017_0001
Formula VIII,
Formula X.
10. A printing material, comprising: a substrate that includes a multivalent salt associated with the substrate, wherein the multivalent salt is selected from Group Il metal, Group III metals, and multivalent transition metals; and a first ink and a second ink, wherein the first ink and the second ink are different dye colors, wherein each of the first ink and the second ink include at least one dye selected from a magenta dye, a yellow dye, and a black dye, and wherein the dye is a sulfonated non-metalized azo dye with a SO3H molecular weight percent of from about 10 to 27%, wherein the first ink and the second ink are disposed on the substrate.
11. The printing material of claim 10, wherein the ink-jet set further comprising a second dye that is a sulfonated non-metalized azo dye with a SO3H molecular weight percent of from 10 to 27%.
12. The printing material of claim 10, wherein the one of the first dye and the second dye are selected from:
Figure imgf000019_0001
wherein X is selected from H or SO3H.
13. The printing material of claim 10, wherein the one of the first dye and the second dye are selected from:
Figure imgf000020_0001
Formula Vl, and
Figure imgf000020_0002
Formula VII.
14. The printing material of claim 10, wherein the one of the first dye and the second dye are selected from:
Figure imgf000021_0001
Formula VIII,
Formula IX, and
Figure imgf000021_0002
Figure imgf000021_0003
Formula X.
15. The printing material of claim 10, wherein the multivalent salt includes a metal selected from the group consisting of calcium, magnesium, copper, nickel, zinc, barium, iron, aluminum, and chromium.
16. A method of printing, comprising: providing a substrate that includes a multivalent salt associated with the substrate, wherein the multivalent salt is selected from Group Il metal, Group III metals, and multivalent transition metals; providing a first ink and a second ink, wherein the first ink and the second ink are different dye colors, wherein each of the first ink and the second ink include at least one dye selected from a magenta dye, a yellow dye, and a black dye, and wherein the dye is a sulfonated non- metalized azo dye with a SO3H molecular weight percent of from about 10 to 27%; and disposing the first ink and the second ink on the substrate.
17. The method of printing of claim 16, wherein the ink-jet set further comprising a second dye that is a sulfonated non-metalized azo dye with a SO3H molecular weight percent of from 10 to 27%.
18. The method of printing of claim 16, wherein the one of the first dye and the second dye are selected from:
Figure imgf000023_0001
wherein X is selected from H or SO3H.
19. The method of printing of claim 16, wherein the one of the first dye and the second dye are selected from:
Figure imgf000024_0001
Formula Vl, and
Figure imgf000024_0002
Formula VII.
0. The method of printing of claim 16, wherein the one of the first dye and the second dye are selected from:
Figure imgf000025_0001
Formula VIII,
Figure imgf000025_0002
Formula X.
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